Examine source code of Domain Color Tabs

{
  "manifest_version": 2,
  "name": "Domain Color Tabs",
  "version": "1.0",
  "description": "Highlight tabs with a border color based on their domain.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1db52971-4565-4515-8e51-141207034830}"
    }
  }
}